Interface example in golang

main.go

//A very simple example of an interface in golang

package main

import "fmt"

type apple struct {
	calories int
}
type orange struct {
	calories int
}

type fruit interface {
	getCalories() int
}

func main() {
	fruitOne := apple{}
	fruitTwo := orange{}
	printCalories(fruitOne)
	printCalories(fruitTwo)

}

func printCalories(f fruit) {
	fmt.Println("Calories in fruit are:", f.getCalories())
}

func (o orange) getCalories() int {
	return 200
}

func (a apple) getCalories() int {
	return 100
}